What is this valve for?

Gene&Ginny wrote:
OK, I'll bite.

BurbMan wrote:
Looks like a henway.

Whats a henway?

About Three pounds

OK, I'll bite.

BurbMan wrote:
Looks like a henway.

Whats a henway?

Looks like a henway.

Teeton wrote:
If it's for the fw tank. How is the tank vented when drawing water from the tank?? Should it be opened or closed????

Open, always open. Unless the tank siphons while driving, then closed only while driving.

When I plugged it during filling, then let go it would splash a little dribble of water. I have no doubt that it could siphon water out of the tank. Now that I know what it is, and most likely why it's there, I can keep an eye on it and use it when necessary.

tbiker99,

Now that you know what it's for, make sure it is open when you fill your fresh water tank. When the tank is full (probably slightly over-filled) you may see water come out that drain.

I put similar valves on ours because I've had incidences where I'd fill the tank, hit the road, and 2 hours later, there was still water siphoning out of the vent hose. One of these days, I'll fix that! LOL

In the meantime, I put a valve in line. Now if I fill the tank so the water drains out that valve before hitting the road, I'll close the valve down until it's just a very slight trickle. This limits the leakage yet can provide for air to enter the line should I use the water pump. If that valve is closed you will start creating a vacuum in the water tank, which might cause damage, and you will probably notice a decrease in water flow at the faucets. Usually, you will notice this when you go to use the bathroom in the middle of the night! LOL

Glad to hear you were able to figure it all out.

~Rick

If it's for the fw tank. How is the tank vented when drawing water from the tank?? Should it be opened or closed????

He opened it, and while filling the fresh water tank, air came rushing out. He found what it is for. It is the fresh water tank vent.

Open it and see what comes out if anything. Then trace it down. But just because the hose enters the trailer at a given point does not mean it has anything to do with equipment directly above that point. It may just be a handy place to get the hose through the undercarriage.

I got home early enough to play. Sure enough, air comes out when I'm filling the Fresh water tank. It seems to be a vent with the option of closing it. Thanks for all the inputs.